Zhao Chao 579f5afc64 Use RootHistory to check if root is ever enabled
When disabling root, there is no need to call guestagent to check
whether the root user is ever enabled. Root hisotry table should
be used for this purpose.

As datastore specific root controller of MySQL/Cassandra/PostgreSQL
were created only for the '_find_root_user' which were calling
guestagent to find root user, these controllers are removed and
'DefaultRootController' is used instead.

RedisRootController is also updated as it didn't do this check
previously.

Unittests directory structure is also slightly changed. It's more
clear to use similar directory hierarchies for testing and source
code, e.g.
    trove/extensions/common/service.py
    trove/tests/unitests/extensions/common/test_service.py

Change-Id: I9faac61d9650347b51f23e8fcaf5a92aed5fbf93
Signed-off-by: Zhao Chao <zhaochao1984@gmail.com>
2018-02-28 09:14:36 +08:00
..
2016-12-18 08:18:47 -05:00